System for direct energization of radiotelegraphic antennæ.



E. GIRARDEAU & 1. BETHENOD. v SYSTEM FUR DIRECT ENERGlZATlUN' 0F RADIOTELEGRAPHIC ANTENNE J Patented July 6, 1915.

APPLICATION FILED JUNE IL 1913.

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Specification of Letters Eetent.

Application filed June 17, 1913, Serial No. 774,187.

To all whom it may concern Be it known that We, EMILE- GIRARDEAU- and JOSEPH Bermmoo, citizens or" the Re public of France, residing 128 Rue la Bo tie, Paris, in'the Republic or France, have invented certain new and useful Improvements in Systems for Direct Energizetion of Radiotelcgrephic Antennae, of which the following is a specification.

This invention relates to a system for direct cuergization of radiotclegraphic antenuse by ineans of high frequency polyphese alternator-s.

In order to obtain elteriiatcrs capable of supplying frequencies sufiiciently high to enable them. to he used for the direct energizotiozi of radio-telegraphic arteries:- of great Wave length, it has been proposed to place several elternai'ors in cascade, the ariimiture of one energizing the field of the other. This arrangement is possible in connection with either single phase alternatcrs or with polyphcse alteruators. Only the former however have been. proposed for the direct energizaticn of one antenna Instead of dealing with single phase machines the present invention has recourse to polyphase generators notwithstanding the necessary in crease in Winding pitch in the latter machines.

The present invention relates to a system which enables a high frequency polyphase alternator (which may be of any type) to energize one antenna only, in such condition that the charge is uniformly distributed in all phases which is obviously necessary in order to benefit from the use of polyphase currents.

The accompanying drawing illustrates by Way of example, one Way of carrying out the invention which consists in placing one of the phases 2-2 of the alternator M, assumed to be two-phase, in series with the antenna A, the other phase 1--l feeding a transformer "l" the secondary of which is also placed in series with the aforesaid. antenna A. Adjustable inductorlces L,, L, and cap cities C, are placed 11 the d llurcrit circuits. Under these'conditions, if the mutual induction between the primary and secondary of 'l is appropriately chosen it is easy to show n atheniatically that the two phases of. the alternator can be vigorously charged in an equal manner and if the Values, on one hand, of C, and L, and, on the other, of C, and L, are judiciously chosen, the equal currents circulating in the circuits of the two phases will have neither lead nor lag relatively to the elect-romotive forces generated under no load by the machine M, and obviously the Whole apparatus is thus iii excellent operative condition.

What We claim and desire to secure by Letters Patent of the United States is l. A. system for direct energization of radio-telegraphic antennae comprising in combination, an antenna, a high frequency polyphase alternator having the circuit carrying current of one phase in series with the antenna, a transformer having its secondary placed in series "with the entering adopted to be fed by the current of the other phase from said clternator,-meens for selooting the mutual induction between the primary and secondary of the transformer for allowing a uniform vig' rouscharging of the antenna by the two disses or" the Pet eeeee i c, leis.

alternator, and adjustable inciuctences and capacities placed in the circuit ofthe other phase.

2. An apparatus of the character described, comprising in combination an antonne, a twophase alternator having the circuit carrying current of one phase 0on nected in series with said antenna, a transformer adapted to be fed by current of the other phase from said alternator and comprising a secondary placed in series with the antenna, and inductances and capacities in the circuits so adjusted as to equally distribute the energy of the alternator in the antenna.

In testimony whereof we'clfix our sign: tures in presence of two witnesses.

, El /Elli GIEARDEAU.

- JGSEPH BETHENOD; Witnesses Henson C. Com, JAcK H,

Washizlgtcn, D. C. 

